. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. e end of each of the carbonrods is attached, by a screw clip, a silk thread, w^hich, passing over pidleys, is attached to a weightsliding up and down the two pillars. This weight tends to draw the carbon pairs together. The 672 ELECTEICAL ENGINEERING. current established, the lower pair of carbons is drawn away from the upper by the action of theelectro-magnet, in the base of the lamp, Fig. 1168. The electro-magnet is in two parts, one of whichis fixed, while the other is hinged, so that the passage of the
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. e end of each of the carbonrods is attached, by a screw clip, a silk thread, w^hich, passing over pidleys, is attached to a weightsliding up and down the two pillars. This weight tends to draw the carbon pairs together. The 672 ELECTEICAL ENGINEERING. current established, the lower pair of carbons is drawn away from the upper by the action of theelectro-magnet, in the base of the lamp, Fig. 1168. The electro-magnet is in two parts, one of whichis fixed, while the other is hinged, so that the passage of the current through the coils causes thehingedmagnet to approach the fixed one, lift the sliding rod, and separate the carbons. The baseof the lamp contains also an automatic shunt, which throws into the circuit a resistance equivalentto that of the arc, when the lamp is extinguished. When the current ceases in the coils of theelectro-magnet, the armature is released, and falls back against a fixed contact piece, mtroducinginto the circuit an artificial resistance of carbon. 1168. 1167,. Fig. 1169 is of another form of Eapieff s lamp in which the two pairs of carbons are arrangedside by side, instead of vertically above each other. Above the arc is a cake of lime, which servesto reflect the rays, as well as to maintain the illuminating power during momentary cessation of thecurrent. These lamps can be employed with currents of single or alternate direction. In oneinstance, the pairs of carbons are equally consumed ; in the other, the positive carbons have to bemade twice as long as the negative carbons; and in either the point of intersection of the axis of thecarbons, and consequently of the length of the arc, must remain constant. Six of these lamps havebeen worked on a single circuit, but no data are available as to the power absorbed for lightproduced. Hedge slamp, Fig. 1170, somewhat similar in form to Staite and Edwards, differs in that thevoltaic arc is automatically adjust
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
